<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>CSS对话框</title>
    <style>
        .test {
            width: 300px;
            padding: 30px 20px;
            margin-left: 30px;
            background: #beceeb;
        }
        .test span {
            width: 10px;
            height: 10px;
            font-size: 0;
            overflow: hidden;
            /* position: absolute; */
            background-color: aqua;
        }
    </style>
</head>

<body>
    <div class="test">
        <span class="bot"></span>
        <span class="top"></span>
        CSS “边框法”实现气泡对话框效果一
    </div>
</body>

</html>